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X^-1-((x^1)/2)-20 = 0
X^-1-(x/2)-20 = 0
X^-1-1/2*x-20 = 0 // - X^-1-20
-1/2*x = -(X^-1-20) // : -1/2
x = (-(X^-1-20))/(-1/2)
x = -2*(20-X^-1)
x = -2*(20-X^-1)
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